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interfacing SD/MMC card with AVR microcontroller

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akshay985

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I m working on ATmega16 and trying to interface SD/MMC card in SPI mode only
why the voltage levels drop after card is inserted
 

your supply is getting shorted .. same problem i had ,, and i got it rectified after finding this fault

---------- Post added at 22:48 ---------- Previous post was at 22:47 ----------

which module are you using to insert the card... any readymade module or you developed it
 

what is the voltage of AVR Mcu?:grin:

if it's 3.3volts ok,if it's 5 volts,you need a 3.3v reg for sd card and put voltage divider resistor on spi line ,if your sd card was on 5 volts,may be shorted,fried...
 
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You must use a resistor between the mcu and the sd card or use shift level ic like HC244 or HC4050 fed with 3.3 V.
 

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